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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d792ad63d4a0347fb722503c4d1aa093c056883754c942cf866a236f84ac2c' 
  AND token = 'WZctD9vNFfM0bFdadWe28HeQQWweRKmjbxlUBz0Xplw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}